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Nano body-centered cubic CoFe2 alloy precursor for cobalt ferrite via sonoreduction process

Published online by Cambridge University Press:  31 January 2011

Maya Mohan ,
Vimlesh Chandra  and
S. Sundar Manoharan
Maya Mohan
Affiliation:
Materials’ Chemistry Laboratory, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India
Vimlesh Chandra
Affiliation:
Materials’ Chemistry Laboratory, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India
S. Sundar Manoharan*
Affiliation:
Materials’ Chemistry Laboratory, Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A stable nano body-centered cubic (bcc) CoFe2 alloy was isolated by employing a combination of N2H4.H2O reduction and sonochemical route under basic conditions. This alloy has proved to be a potential precursor for CoFe2O4 production. X-ray diffraction and transmission electron microscopy confirms the formation of a bcc phase CoFe2 alloy with particle size <10 nm and spherical morphology. Thermogravimetric analysis confirmed the oxidation of the alloy composition showing a weight gain between 200 and 500 °C, which corresponds to fully oxidized CoFe2O4. A significant increase in the saturation magnetization (Ms = 230 emu/g) for the nano CoFe2 alloy was observed in comparison with that of the theoretical bulk value (200 emu/g) at 300 K.

Keywords

AlloyFerromagneticNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 7 , July 2008 , pp. 1849 - 1853
Copyright
Copyright © Materials Research Society 2008

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